308 HARRISON G. DYAR. 



depressed anteriorly. All as in the previous two stages: skin smooth, but not 

 shining ; at the end of this stage the larvie fade to a whitish color with a bright 

 green dorsal. hand and enter the earth without molting. 



Cocoon double, the outer layer thin, brown, the inner dark brown, compact, but 

 not very hard ; size 4 x 8 mm. 



Larvae found at Woods Holl, ]Mass., Jefferson, N. H., and at 

 Plattsburgh, N. Y. 



Solitary, resting on the venter on the under surface of a leaf; 

 eating only the lower epidermis and parenchyma until nearly full 

 grown, when they eat the whole leaf for a short time. The food- 

 plant is the sugar plum (Ainelanchier canadend-i). 



Nematus iinicolor Marlatt MS.* (4.T). Larva. — Head slightly granular, 

 shagreened, a little pilose, pale browni.sh, pale around mouth, not sliining; eye on 

 a black spot; two blackish shades on the back of head behind the vertex ; width 

 1.8 mm. Thorax a little enlarged, its feet spreading; venter flattened ; feet on 

 joints 6-11 and 13; subventral region vslightly fluted with a few pale setse ; seg- 

 ments not very completely 5- to tJ-annulate, segmental incisures folded, not 

 shining, translucent greenish, food giving a dusky tint; subdorsally below the 

 skin a series of emerald-green or pale green granules and streaks, forming a 

 nearly continuous band or even an evident white subdorsal band ; tracheal line 

 evident ; spiracles pale. When mature the larvse became ])ale yellowish with a 

 bright emerald green tint on the thorax and entered the ground. 



Cocoon as usual. 



Shape and habits of the preceding. Found on the white birch at 

 Keene A^alley, New York. 



Poecilosoma iiifer«'iilia Norton. 



Larvx. — Singly on alder, stretched out flat on the surface of the leaf; smooth, 

 not shining, pale leaf-green, covered with a white bloom; segments 6-annulate. 

 Body slightly largest through the thorax, smaller posteriorly. Thoracic feet not 

 large, just visible from the dorsal aspect ; abdominal ones on joints 6 -12, 13 pos- 

 teriorly. Head with a white bloom ; eye surrounded by a black spot; width 1.2 

 mm. ; length of larva 18 mm. 



Last stage. — No white bloom. Body .smooth, slightly shining, pale green, a little 

 yellowish and rather opaque. Head less green, eye black ; gradually the larva 

 becomes a translucent waxen pinkish and seeks a place for hibernation. 



Found on the alders in Keene Valley, New York, the imagoes 

 the following April. 



The two sexes of this fly are very different, and the female has 

 been described by Provancher as Strongy log aster albosecta. 



]VIono|>lia<liiiiS barda Say. Larva. — Head black throughout, not very 

 shiny, smooth; width 1.6 mm. Feet on joints G-13; body thick, sides perpendicular ; 

 no ridge ; segments 6-aunulate, the annulets less distinct than the segmental in- 



* Mr. Marlatt identifies the fly bred from this larva with specimens from Mt. 

 Hood. Oregon, to which he has given the MS. name of Pteronus imicolor. 



